Need help with tuning my 340

same ol crap weather up here and taxes going up all the time...nothing new

on the brighter side ...you need to get your timing set first , take a vacuum reading and go from there ...any manifold port will work ...carb port only if it is below the throttle plates. you want to measure the manifold vacuum.
if you find the power valve in there now is way off be sure to go back up in jet size to be safe.